/*
 * Copyright 2013-2023 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package cn.huava.cloud.order.mq;

import java.util.List;
import org.apache.rocketmq.client.producer.MessageQueueSelector;
import org.apache.rocketmq.common.message.Message;
import org.apache.rocketmq.common.message.MessageQueue;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.messaging.MessageHeaders;
import org.springframework.stereotype.Component;

/**
 * @author sorie
 */
@Component
public class OrderlyMessageQueueSelector implements MessageQueueSelector {
  private static final Logger log = LoggerFactory.getLogger(OrderlyMessageQueueSelector.class);

  /**
   * to select a fixed queue by id.
   *
   * @param mqs all message queues of this topic.
   * @param msg mq message.
   * @param arg mq arguments.
   * @return message queue selected.
   */
  @Override
  public MessageQueue select(List<MessageQueue> mqs, Message msg, Object arg) {
    Long id = (Long) ((MessageHeaders) arg).get("subjectId");
    int index = (int) (id % mqs.size());
    return mqs.get(index);
  }
}
